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                        条件判断语句
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                        for...else语句的使用
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                        <h2 id="if&#x8BED;&#x53E5;&#x7684;&#x4F7F;&#x7528;">if&#x8BED;&#x53E5;&#x7684;&#x4F7F;&#x7528;</h2>
<h3 id="&#x4E00;&#x3001;if&#x5224;&#x65AD;&#x8BED;&#x53E5;&#x4ECB;&#x7ECD;">&#x4E00;&#x3001;if&#x5224;&#x65AD;&#x8BED;&#x53E5;&#x4ECB;&#x7ECD;</h3>
<ul>
<li>if&#x8BED;&#x53E5;&#x662F;&#x7528;&#x6765;&#x8FDB;&#x884C;&#x5224;&#x65AD;&#x7684;&#xFF0C;&#x5176;&#x4F7F;&#x7528;&#x683C;&#x5F0F;&#x5982;&#x4E0B;&#xFF1A;</li>
</ul>
<pre><code class="lang-python">    <span class="hljs-keyword">if</span> &#x8981;&#x5224;&#x65AD;&#x7684;&#x6761;&#x4EF6;:
        &#x6761;&#x4EF6;&#x6210;&#x7ACB;&#x65F6;&#xFF0C;&#x8981;&#x505A;&#x7684;&#x4E8B;&#x60C5;
</code></pre>
<ul>
<li>demo1:</li>
</ul>
<pre><code class="lang-python">    age = <span class="hljs-number">30</span>

    print(<span class="hljs-string">&quot;------if&#x5224;&#x65AD;&#x5F00;&#x59CB;------&quot;</span>)

    <span class="hljs-keyword">if</span> age &gt;= <span class="hljs-number">18</span>:
        print(<span class="hljs-string">&quot;&#x6211;&#x5DF2;&#x7ECF;&#x6210;&#x5E74;&#x4E86;&quot;</span>)

    print(<span class="hljs-string">&quot;------if&#x5224;&#x65AD;&#x7ED3;&#x675F;------&quot;</span>)
</code></pre>
<ul>
<li>&#x8FD0;&#x884C;&#x7ED3;&#x679C;:</li>
</ul>
<pre><code class="lang-python">    ------<span class="hljs-keyword">if</span>&#x5224;&#x65AD;&#x5F00;&#x59CB;------
    &#x6211;&#x5DF2;&#x7ECF;&#x6210;&#x5E74;&#x4E86;
    ------<span class="hljs-keyword">if</span>&#x5224;&#x65AD;&#x7ED3;&#x675F;------
</code></pre>
<ul>
<li>demo2:</li>
</ul>
<pre><code class="lang-python">    age = <span class="hljs-number">16</span>

    print(<span class="hljs-string">&quot;------if&#x5224;&#x65AD;&#x5F00;&#x59CB;------&quot;</span>)

    <span class="hljs-keyword">if</span> age &gt;= <span class="hljs-number">18</span>:
        print(<span class="hljs-string">&quot;&#x6211;&#x5DF2;&#x7ECF;&#x6210;&#x5E74;&#x4E86;&quot;</span>)

    print(<span class="hljs-string">&quot;------if&#x5224;&#x65AD;&#x7ED3;&#x675F;------&quot;</span>)
</code></pre>
<ul>
<li>&#x8FD0;&#x884C;&#x7ED3;&#x679C;:</li>
</ul>
<pre><code class="lang-python">    ------<span class="hljs-keyword">if</span>&#x5224;&#x65AD;&#x5F00;&#x59CB;------
    ------<span class="hljs-keyword">if</span>&#x5224;&#x65AD;&#x7ED3;&#x675F;------
</code></pre>
<p>&#x5C0F;&#x603B;&#x7ED3;&#xFF1A;</p>
<ul>
<li>&#x4EE5;&#x4E0A;2&#x4E2A;demo&#x4EC5;&#x4EC5;&#x662F;age&#x53D8;&#x91CF;&#x7684;&#x503C;&#x4E0D;&#x4E00;&#x6837;&#xFF0C;&#x5BFC;&#x81F4;&#x7ED3;&#x679C;&#x5374;&#x4E0D;&#x540C;&#xFF1B;&#x80FD;&#x591F;&#x770B;&#x5F97;&#x51FA;if&#x5224;&#x65AD;&#x8BED;&#x53E5;&#x7684;&#x4F5C;&#x7528;&#xFF1A;&#x5C31;&#x662F;&#x5F53;&#x6EE1;&#x8DB3;&#x4E00;&#x5B9A;&#x6761;&#x4EF6;&#x65F6;&#x624D;&#x4F1A;&#x6267;&#x884C;&#x4EE3;&#x7801;&#x5757;&#x8BED;&#x53E5;&#xFF0C;&#x5426;&#x5219;&#x5C31;&#x4E0D;&#x6267;&#x884C;&#x4EE3;&#x7801;&#x5757;&#x8BED;&#x53E5;&#x3002;</li>
<li>&#x6CE8;&#x610F;&#xFF1A;&#x4EE3;&#x7801;&#x7684;&#x7F29;&#x8FDB;&#x4E3A;&#x4E00;&#x4E2A;tab&#x952E;&#xFF0C;&#x6216;&#x8005;4&#x4E2A;&#x7A7A;&#x683C;</li>
</ul>
<h3 id="&#x4E8C;&#x3001;&#x7EC3;&#x4E00;&#x7EC3;">&#x4E8C;&#x3001;&#x7EC3;&#x4E00;&#x7EC3;</h3>
<p>&#x8981;&#x6C42;&#xFF1A;&#x4ECE;&#x952E;&#x76D8;&#x83B7;&#x53D6;&#x81EA;&#x5DF1;&#x7684;&#x5E74;&#x9F84;&#xFF0C;&#x5224;&#x65AD;&#x662F;&#x5426;&#x5927;&#x4E8E;&#x6216;&#x8005;&#x7B49;&#x4E8E;18&#x5C81;&#xFF0C;&#x5982;&#x679C;&#x6EE1;&#x8DB3;&#x5C31;&#x8F93;&#x51FA;&#x201C;&#x54E5;&#xFF0C;&#x5DF2;&#x6210;&#x5E74;&#xFF0C;&#x7F51;&#x5427;&#x53EF;&#x4EE5;&#x53BB;&#x4E86;&#x201D;</p>
<blockquote>
<ol>
<li>&#x4F7F;&#x7528;input&#x4ECE;&#x952E;&#x76D8;&#x4E2D;&#x83B7;&#x53D6;&#x6570;&#x636E;&#xFF0C;&#x5E76;&#x4E14;&#x5B58;&#x5165;&#x5230;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x4E2D;</li>
<li>&#x4F7F;&#x7528;if&#x8BED;&#x53E5;&#xFF0C;&#x6765;&#x5224;&#x65AD; age&gt;=18&#x662F;&#x5426;&#x6210;&#x7ACB;</li>
</ol>
</blockquote>

                    
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